共轭体系
噻吩
材料科学
兴奋剂
聚合物
离域电子
类型(生物学)
热电效应
导电聚合物
结晶学
高分子化学
有机化学
光电子学
化学
物理
生态学
热力学
复合材料
生物
作者
Xiaokang Geng,Tian Du,Chenhui Xu,Yingying Liu,Yunfeng Deng,Yanhou Geng
标识
DOI:10.1002/adfm.202300809
摘要
Abstract Selective doping of a single conjugated polymer (CP) to obtain p ‐type and n ‐type conductive materials would be highly attractive for organic thermoelectric applications, because it will greatly reduce the time and costs of synthesizing different types of CPs. However, this strategy has rarely been investigated. In this study, two CPs are synthesized, designated PTQDPP‐T and PTQDPP‐2FT, based on a newly developed quinoidal unit with thienoisatin as the termini and a thiophene‐flanked diketopyrrolopyrrole (ThDPP) unit as the quinoidal core. The electron‐rich thiophene rings in thienoisatin and the electron delocalization induced by thienoisatin resulted in polymers with high‐lying highest occupied molecular orbital, and the electron‐deficient nature of ThDPP unit and its quinoidal backbone endowed the polymers with low‐lying lowest unoccupied molecular orbitals. As a result, both polymers can be p ‐type and n ‐type doped. Because of its high mobility, doped PTQDPP‐2FT performed better in organic thermoelectric devices than the doped PTQDPP‐T. After being doped with FeCl 3 and N‐DMBI, PTQDPP‐2FT showed p ‐type and n ‐type power factors of 278.2 and 2.37 µW m −1 K −2 , respectively. These are the best for bipolar ( p ‐type and n ‐type) performances that obtained by selective doping of a single polymer.
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